* possibly add -n to dump the linenumber
* maybe add optimization useing seek() in file
* maybe add smarter memory management allocating the buffers only once
* work out if the arithmetic holds for large values
* debianize
* add/change functionality: randomize lines in input (in 0.2.x?)
* maybe put all headers in one headerfile (maybe even bring back xmalloc stuff)
* automaticly (configure) select the best way to seed the random number generator